COVER STORY TEST RESULTS STRONGER
CORRELATION BETWEEN THE MEASUREMENT ON THE PERSON & THE HUMAN RESPONSE TO VIBRATION.
THEREFORE AN AID TO RISK ASSESSMENT MORE TAILORED TO AN INDIVIDUAL.
CORRELATION BETWEEN THE MEASUREMENT ON TOOL & THE
LIMITED
HUMAN RESPONSE TO VIBRATION. CAN DISTINGUISH BETWEEN TWO
MODES OF TOOL USE BUT NOT IMPACT OF THE TOOL USER AND POSTURE.
HAV WEAR PROVIDES DATA WHICH IS A SUITABLE AID TO RISK ASSESSMENTS
Assessing correlation of human response to vibration through vibro- tactile threshold shift with vibration exposure determined on a tool user with a wrist worn HAVwear device.
After being exposed to vibration, a person’s ability to sense at the end of the finger is temporarily reduced. This is called the temporary threshold shift (TTS) in vibrotactile perception. The greater the vibration magnitude of exposure, the greater is the TTS.
The paper’s research evaluates the relationship between vibration magnitude assessment on subjects using wearable sensors (HAVwear) and sensors placed on the tool, with temporary threshold shift (TTS) in vibrotactile perception.
Simultaneous vibration measurements were undertaken on the person with a HAVwear and at the tool hand-grip interface in accordance with ISO 5349-2. Two modes of tool operation (drill and impact) and two postures (horizontal and vertically downwards) of tool use were considered.
The results demonstrate a stronger relationship between the hand transmitted vibration determined by the HAVwear on the subjects and TTS over the conventional measurement on the tool. It could be further hypothesised that control measures derived from in-use tool data would be more effective in reducing the underlying risk to operatives.
TEST METHOD 1
FORCE PLATE TO CONTROL PUSH FORCE
POWER TOOL STANDARD INDUSTRIAL DRILL
WITH DRILL & HAMMER DRILL SETTINGS VIBROTACTILE
PERCEPTION TO MEASURE THE TEMPORARY THRESHOLD SHIFT (TTS) IN VIBROTACTILE PERCEPTION ABILITY TO SENSE
14
MALE TOOL USERS
18-24
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Reactec Ltd, 3 Cultins Road, Edinburgh EH11 4DF 0131 221 0930
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2 2
POSTURES
HOLDING THE DRILL HORIZONTALLY AND DOWNWARDS
HORIZONTAL
SIMULTANOUS MEASUREMENTS 2 ON-PERSON ISO5349
ISO8041 ON-TOOL
1
Download the report at
www.reactec.com/assessing_correlation_of_ human_response_to_vibration
VERTICAL
YEARS
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